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MIDI Bass Pedal Encoder with LCD Menu

 

MIDI Bass Pedal Encoder with LCD Menu

 

This MIDI Bass Pedal Encoder is capable of encoding any number of momentary action, push to make, single pole single throw (SPST), switches from 0 to 127 to produce the equivalent MIDI note-on/note-off data commands on any MIDI Channel (1 to 16). The encoded switches are wired via IN4148 diodes.

 

The unit can work with any size bass pedal-board. Any unrequired/unused pedals can be left unconnected.  Note if less than 128 switches are required, then ONLY the switches required need to be wired.

 

This unit can be connected to new pedal boards or it can be used with an older non-MIDI pedal board by using magnetic/reed switches to isolate the old and new scanning circuits. 

 

This unit provides a MIDI output to a standard MIDI DIN socket and also the USB connection, at the same time. This unit can work in standard MIDI mode, at a MIDI Baud rate of 31250,  or via the USB connection at a Baud rate of 38400, using the USB/MIDI drivers.

  

16x8keys_LCD.JPG (43949 bytes)

 

MIDI Bass Pedal Encoder with LCD Menu

ITEM#: MIDIBASSPEDLCD

PRICE:  €75.00


 

 

 

 

The MIDI Bass Pedal Encoder with LCD Menu Unit consists of:

  • The MIDI channel, Program Change, Velocity and Transpose are selected via the switches on the LCD menu,
  • An assembled Arduino MEGA board,
  • A 2.1mm power socket, and associated LED, 
  • USB power or external power choice,
  • A MIDI 5-pin DIN output socket,
  • The switches circuit schematic is available,

 

 

The MIDI Bass Pedal Encoder with LCD Menu unit requires:

  • a 9v battery or equivalent DC power source or USB connection,
  • Suitable key-switches or magnetic reed switches and associated IN4148 diodes

 

Circuit Schematic:

A switches circuit schematic of the MIDI Bass Pedal Encoder with LCD Menu shows the switch connections. The circuit schematic for the Arduino MEGA and the Arduino Mega Pins layout,  are also available.

 

  

  

  

 

Menu Selection & Specification: :

The Menu Selection button cycles through the Menus:

  • MIDI Channel: 1 to 16
  • Program Change: 0 to 127
  • Velocity: max 127
  • Transpose: +/- 2 Octaves in semitone steps

 For each Selection the Value up/down buttons can set the MIDI Channel, Program Change, Velocity and Transpose values. Also the MIDI Channel, Program Change and Velocity values are stored in EEPROM so they are remembered each time the unit is powered up or reset.

 

 

MIDI OUT Wiring:

 midi_out_LCD.JPG (56402 bytes)

     *Click to Enlarge*

The MIDI OUT connector uses  5-Pin 180 degree DIN socket. Note that the MIDI OUT wiring is polarised and the correct pins should be used.

 

 

 

MIDI 128 Note MIDI Bass Pedal Encoder Wiring:

The switches are organized in a 16 x 8 matrix (up to 128 switches) arrangement.  Note if less than 128 switches are required, then ONLY the switches required need to be wired. 


The lowest note  is switch SW0 wired via diode D0 between Pins 22 and 23 of the Arduino MEGA.

The next note  is switch SW1 wired via diode D1 between Pins 24 and 23 of the Arduino MEGA.

The next note  is switch SW2 wired via diode D2 between Pins 26 and 23 of the Arduino MEGA.

The next note  is switch SW3 wired via diode D3 between Pins 28 and 23 of the Arduino MEGA.

The next note  is switch SW4 wired via diode D4 between Pins 30 and 23 of the Arduino MEGA.

The next note  is switch SW5 wired via diode D5 between Pins 32 and 23 of the Arduino MEGA.

The next note  is switch SW6 wired via diode D6 between Pins 34 and 23 of the Arduino MEGA.

The next note  is switch SW7 wired via diode D7 between Pins 36 and 23 of the Arduino MEGA

 

Pin 22 is also looped to the Anodes of 15 other Diodes D8, D16, D24, D32, D40, D48, D56, D64, D72, D80, D88, D96. D104, S112,  and D120.

 

Pin 24 is also looped to the Anodes of Diodes D10, D19, D28, D37, D46, D55, D64, D73, D82, D91 and D100.

 

The other 7 pins 24,  26, 28, 30, 32, 34 and 36 are wired in a similar manner to the other Diodes.

 

Pin 23 is connected to switches SW0 to SW7,

Pin 25 is connected to switches SW8 to SW15,

Pin 27 is connected to switches SW16 to SW23,

Pin 29 is connected to switches SW24 to SW31,

Pin 31 is connected to switches SW32 to SW39,

Pin 33 is connected to switches SW40 to SW47,

Pin 35 is connected to switches SW48 to SW55,

Pin 37 is connected to switches SW56 to SW63,

Pin 39 is connected to switches SW64 to SW71,

Pin 41 is connected to switches SW72 to SW87,

Pin 43 is connected to switches SW88 to SW95,

Pin 45 is connected to switches SW96 to SW103,

Pin 47 is connected to switches SW104 to SW111,

Pin 51 is connected to switches SW112 to SW119,

Pin 53 is connected to switches SW120 to SW127.

 

Each of the other side of these group of 8 switches (eg SW0 to SW7 etc.) is wired to a diode on the Cathode (K) side (end of diode with stripe).

The other side of each of these diodes is looped to  other diodes. 

  

Power Supply:

The  Arduino MEGA can be powered via the USB connection or with an external power supply. The power source is selected automatically. 

 

External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. A low dropout regulator provides improved energy efficiency.

 

The board can operate on an external supply of 7 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.